National semiconductor LM78XX Series voltage Regulators F∞×0 General Description de range of applica is local on card bypassing is needed only if the regulator is located far from 9 gulation, eliminating the distribution problems associated the filter capacitor of the power supply rith single point regulation. The voltages available allow For output voltage other than 5V, 12V and 15v the LM117 with extermal components to obtain these Features The LM78XX series is available in an aluminum To-3 pack. Intemal the nt in excess of 1A heat No external components i nking is provided. Current limiting is included to limit a Internal short circuit curren he output transistor is provided to limit intemal power dissi. a Available in the aluminum ation. If internal power dissipation becomes too high for e heat sinking provided, the thermal shutdown circuit Voltage Range ries of regulators easy to use and minimize the number LM7812C Considerable effort was expanded to make the LM78Xx se- LM7815G Schematic and Connection Diagrams Metal Can Package OUTPUT TL/H7746-2 Order Num M7805 See Ns Packa TLH7746-2 umber LM7805CT CT or LM7815CT ckage Number To3B TLH/746=1TL/H/7746 LM78XX Series Voltage Regulators February 1995 LM78XX Series Voltage Regulators General Description The LM78XX series of three terminal regulators is available with several fixed output voltages making them useful in a wide range of applications. One of these is local on card regulation, eliminating the distribution problems associated with single point regulation. The voltages available allow these regulators to be used in logic systems, instrumenta￾tion, HiFi, and other solid state electronic equipment. Al￾though designed primarily as fixed voltage regulators these devices can be used with external components to obtain adjustable voltages and currents. The LM78XX series is available in an aluminum TO-3 pack￾age which will allow over 1.0A load current if adequate heat sinking is provided. Current limiting is included to limit the peak output current to a safe value. Safe area protection for the output transistor is provided to limit internal power dissi￾pation. If internal power dissipation becomes too high for the heat sinking provided, the thermal shutdown circuit takes over preventing the IC from overheating. Considerable effort was expanded to make the LM78XX se￾ries of regulators easy to use and mininize the number of external components. It is not necessary to bypass the output, although this does improve transient response. Input bypassing is needed only if the regulator is located far from the filter capacitor of the power supply. For output voltage other than 5V, 12V and 15V the LM117 series provides an output voltage range from 1.2V to 57V. Features Y Output current in excess of 1A Y Internal thermal overload protection Y No external components required Y Output transistor safe area protection Y Internal short circuit current limit Y Available in the aluminum TO-3 package Voltage Range LM7805C 5V LM7812C 12V LM7815C 15V Schematic and Connection Diagrams TL/H/7746 –1 Metal Can Package TO-3 (K) Aluminum TL/H/7746 –2 Bottom View Order Number LM7805CK, LM7812CK or LM7815CK See NS Package Number KC02A Plastic Package TO-220 (T) TL/H/7746 –3 Top View Order Number LM7805CT, LM7812CT or LM7815CT See NS Package Number T03B C1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A